Riddle



July 10, 1928. 1,676,285 H. PRELL RIDDLE July 10, 1928. I 1,676,285

H. PRELL RIDDLE Filed Dec. 51, 1923 a Sheets- Sheet 2 ZJ liz'y llIIIIJIIIIIII/ I July 10, 1923. 1,676,285

H. PRELL RIDDLE Filed Dec. 51,. 1925 a: Sheets- Sheet 3 Patented July10, 1928.

HENRY PRELL, OF CHICAGO, ILLINOIS.

RIDDLE.

Application filed. December 31', 1-923. SerialNo. 683,658.

This invention relates to improvements in riddles for screening orsitting sand in foundries, in building and for other purposes.

The objects of this invention are to provide means for agitating ariddle by centrifugal force; to provide an improved means for suspendingthe riddle so as to produce an effective agitation or vibration thereof;to provide an improved means for freely supporting'the riddle and a.motor therefor; to provide an improved stand or support upon which theriddle is adapted to be suspended, such standibeing readily mov able bythe opera-tor; toprovide an improved suspension connection of the riddleupon the stand or support therefor; to provide an improved means forclamping the riddle itself in the suspended frame.

I Further objects. of this invention are to provide an improved shaftconnection bemotor casing and at the same time permit on line 1010 ofFig. 7.

oiling of the motor without removingthe casingcover. [Other objectswillbeapparent from the following descriptionand claims when considered inconnection with the accompanying drawings. V v 1 Fig. '1, isaperspective view of my. improved device in its entirety; Fig. 2 is asectional detail view of the riddle without its support; Fig. 3 is asectional detail view of my improved bearing lfor the ends of the shaft;Fig. 4 shows a modified'form of supportpFigs. 5 and 6 are detai'l viewsof the shaft connection between the motor and the weight;'Fig. 7 is asectional viewtaken on line 7-7 of Fig. 2 and shows av second form ofsupport includingatrolley; Fig. 8 is a view taken on line 8+8 of'Fig. 2;Fig. 9. is a detail view take-non line 99 of Fig. 2; and Fig. 10 is adetail view taken The riddle itself, which may be of suitableconstruction, is here illustrated as corn prising the wire mesh bottom 1which is supported between the lower hoop member 2 of wood or any othersuitable materiajliand the upper hoop 3, the edge portion-0t the wiremesh being flanged upwardly as indicated at sand secured in position bymeans I of the outer hoop 5. The outer hoop is riveted to the other twohoops 2 and. Thewi-re mesh 1 may of course be of any grade or gaugedesired. The hoop 3 is clamped at diametrically opposite points :be-

tween the jaws 6 and '7 by meansof the bolts 8 extending therethroughand the wingjnuts 9 which are adapted to bescrewed upon the bolts. IThe. jaws '6 are provided upon the 1 lower extreme end portions of thesuspension rrame indicated in a general way by refer ence' numeral '10,while the jaws 7 are piv'j- .otal'ly mounted at thep'oints' 11 Withinthe cut-out portions l2 provided in the lower part of theit'rame' 10.The leaf springs'13- are secured by -means 'ofthe screws 14 to the upperpart of the jaws 7, and bear at their other endsagainst the inside faceof the re .cesses 12, the tendency of these springs being to normallyforce the jaws 7 into opened or released position so as to permitremoval of the riddle from the suspension frame. There I I Iare'provided also the projections 15 onopposite sides of the upper parto-t' the jaws 6, as clearly shown in Figs. 2 and 7 for the purpose oflimiting the upward insertion, of v the riddle between thejaws, thereby'insnring proper clamping engagement of the hoop 3 between the aws. Theinner faces of the jaws 6 and 7 are tor-med in-the manner as Isubstantially pyramid form as illustrated in the drawing.

The upper part of the suspension trame,

- ofwhich the legs 10 form 'the'lower'partis enlarged so as toprovide'an integralcasing for enclosure of the operating motorl 1,8. Theentire suspension frame including the motor oasing is made as a singlecasting preferably of aluminum so as to keep the ;clearly illustrated inFigs; 9and. 10 so as to motor cool by rapid radiation of the, heatdeveloped- The aluminum "cover 19 of the place is greatly facilitated.

motor casing is detachably secured by means of the screw bolts and isprovided with an apertured ear 21 for suspension upon the hook 22. Theupper portion of the hook 22 extends through an apertured ring member 23which is provided upon its upper marginal portion with radiallyextending grooves or serrations 24 to provide seating engagement for thecross bar 25 on the upper end of the hook 22. The annular ring member 23forms part of a bracket 26 which is removably secured by means of setscrew 27 on the overhanging end portion of the upright standard orsupport 28. An eye 29 is alse provided upon the one side of the bracket26, such eye serving as a means for threading the electric wire 30 whichhas the socket connection 31 through the casing cover to the electricmotor 13. The lower end of the standard 28 is adapted to rest upon thefloor or ground where the riddle is being used and a three arm singlecasting 32 is secured to the standard 23 by means of the set screw 33,while the other two arms of the casting have secured therein by means ofthe set screws 34 the angular-1y disposed and downwardly extending pipesor rods 35 upon the lower end of which are mounted the rollers 36. Thusthere is provided a three point supporting means, with the riddle itself supported at a point between the rollers and'the bottom of thestandard 28. The handle 36 which is secured upon the standard 28 bymeans of the set screw 37 serves as a means of raising the standard fromthe floor so as to roll the entire device on the wheels or rollers 36 tothe position desired, the riddle during this time being convenientlysuspended at a point substantially above the rollers themselves. In thisway the movement of the device from place to It will be seen also thatby virtue of the free manner of suspension of the riddle upon itssupport, it can be readily swung about the hook 22 so as to dump thesame without disturbing the rest of the device. I Fig. 4illustrates thecon ncction of an extension rod 28 which may be connected to the support28 by means of the sleeve 28" and sct'screws 28, and upon the outer endof which the bracket 26 may be secured, so as to suspend the riddle overthe workmans bench.

The electric motor 18 is mounted upon the pads 38 provided in the bottomof the casing and the wire connection 30 to the motor is shown'in Fig.2. The auxiliary shafts 39 extend in alignment with the stub shaft ends40 of the rotor of'the electric motor and a yieldable connection isprovided between the adjacent ends of the auxiliary shafts and rotorshaft ends so as to permit cooking or universal movement of theauxiliary shafts 39 as may be necessary due to inaccurate .seatingof themotor. Such yieldable connection comprises the collar 41 which is fixedupon the shaft- 39 by means of the set screw 42, and the collar 43 whichis fixed upon the end of the rotor shaft by means of the set screw 44,these parts being so arranged that the extreme end port-ions of theauxiliary shafts 39 project into the collars 43 as clearly indicated inFig. 2. There is also a slight clearance at all times between theadjacent ends of the shafts 39 and the shaft ends of the rotor. Thecollar 41 is provided with the arm 45 to which is secured at 45 one endof the strap 46 of leather or other suit able flexible material, theother end of which is secured at 43 to the collar 43. The leatherconnection 46 extends circumferentially of the axis of the shaftconnection and there is a certaindegree of pivotal movement permitted atthe points 43 and 45, so that the necessary degree of automaticadjustment is permitted without any noise. The motor shaft rotates insuch direction that it pulls the auxiliary shafts with it. Upon theouter ends of the auxiliary shafts 39 are mounted the centrifugalweights 47 by means of the set screws 48, these two weights beingplacedat substantially180 with respect to each other uponthe mainoperating axis of the motor. Proper clearance is allowed bet-ween theweights and the ends of the casing so as to avoid chattering. Theseweights are preferably of substantially the same size, as illustrated inFig. 2 of the drawing, although they may vary. The extreme end portionsof the auxiliary shaft 39 are formed wit-h a double bevel as indicatedat 49 and are provided with the ball bearing 50, the crest of the bevelend portions being on the center line of the balls 51 of the bearing,this being clearly indicated in Fig. 3. The ball bearing is supportedwithin the suitably formed cap 52 which is clamped onto the ends of thecasing by means of the screw bolts 53 so as to permit ready removalthereof. Between the ball bearing and the cap itself there is providedthe felt packing 54 which is adapted not only to hold the oil for thebearing but also to serve'as a screen for keeping dirt and other foreignmatter out of the bearing, the oil being supplied through the oil cup 55which is threaded into the center portion of the cap 52..

The oil wells 56 on the ends of the motor are provided with the upwardlyextending tubes 57 upon which are provided the en larged collar members58. These enlarged portions 58 are adapted to receive by telescopicengagement the lower ends of the oil feed pipes 59 which are screwedinto the casing cover 19 and extend therethrough to the outside asclearly indicated in the draw- 1 ings. In this wayit is possible to oilthe motor without removing thecasing cover while at the same time it ispossible also to vided'in the oil' feed means.

remove the casing cover whenever desired due tothe readily separableconnection pro- Such orl connections are prov ded upon opposite sides Inthis way it is possible to open the closure andadjust the brusheswithout otherwise disturbing the motor or its enclosing casing.

The form of suspension shown in Fig. 7 is especially adapted for useupon a trolley track where it is desired to have theriddle movedoverhead and over a considerable distance. In this case the annularserrated ring member 23 instead of being provided, as

part of a bracket. on an upright standard is provided as part of aclosed loop member 62, theupper restricted portion being supported inthe hook 63 which in'turn is carried upon the bracket 64 having therollers 65 for rolling engagement with theoverhead track 66.

The electric rail- 67 supplies current to the wiping contact member 68which is carried by the bracket contact 64: and which is in circuit withthe electric line 69. The wire 69 is threaded through the loop member'62and thence through the motor casing to the motor in the same manner asbefore dey scribed.

Operation of the motor sets up a centrif ugal force due to the opposedarrangement of the weights on the ends of themotor axis and such forcewill be transmitted through the freely suspended frame to the riddle. Asthis centrifugal force is effective throughout the full 360 of rotationof the motor shaft. there will be continuous vibration or agitation ofthe supporting-frame and the riddle in continuously changing directions.The center of such vibratory motion of the motor shaft will correspondapproximately with the central point of the motor itself. In otherwords, referring to the position shown in Fig. 2 of the drawing, therewill be a downward motion of the left hand end of the motor-shaft. andat the same time an upward motion of the right hand motion of therighthand end of the motor shaft; then when the shaft has turned through180 there will be opposite motions from V the two ends of the shaftrespectively and the directions of the motions of the two ends of themotor shaft will change continuouslv in such manner throughout theentire 360 of travel. Thus the effect of the centrifugal force is at oneinstant to vibrate the supporting frame and the riddle through avertical plane, at another inst-ant to cause such vibration through ahorizontal plane, and at other intervening instants to cause vibrationtion; Moreover, the freely suspended Weight through "the manyintervening planes. Thus there may be said to setup somewhato'f agyrating-mot-ion. v By virtue of the f-reemanner of suspension of thesupportingframe the vibratory motion is-effectively transmitted to therid die and at the same timethe motor itself which is likewise freelysuspended does not suffer any detrimental shock from {such moof themotor assiststhe vibrating movement by virtue of its momentum.Furthermore, with the presentarrangement inwhich the motor and'ot-herparts-are so suspended that the motor vibrates about its center, aminimum amount of power is required to produce the desired vibration ofthe riddleitself which is suspended at the other end of the suspensionframe 10. I

What I claim is: y

1. Apparatus of the'character described, comprising a casing, amotorcentrally disposed therein and having a horizontal shaft,

auxiliary shafts on either'end of said motor shaft in substantiallyaligned driven relation therewith and having bearings in said casing, aweight carried by each of said auxiliary shafts and unbalancedtherefrom,depending arms on said casing adapted to support an element .to bevibrated in unison with said casing, andmeans for suspending saidcasing.

2. Apparatus of the character described,"

comprising a casing, a motor centrally disposed therein and havinga-horizontal shaft, auxiliary shafts on either end of said motor shaftin substantially aligned driven relation therewith and having bearingsin said casing, a weight carried by each auxiliary auxiliary shaft andunbalanced therefrom,

dependingarms on said casing adapted to support an element to bevibrated in unisonwith said casing, said auxiliary shafts and said armslying in substantially the'same general I plane, and means forsuspending said casing. V

4:. Apparatus of the character described, comprising a casing, a motorcentrally disposed therein and having a horizontal shaft, auxiliaryshafts on either end of said motor shaft in substantially aligned drivenrelation therewith, each auxiliary shaft being in supporting engagementat its inner end with 115 ends of said casing, a. weight carried by eachan end of said motor shaft and bearing at its outer end in said casing,a Weight on each auxiliary shaft adjacent the bearing thereof in thecasing and unbalanced on the shaft, depending arms on said casingadapted to support an element to be vibrated in unison with said casing,and means for suspending said casing.

5. Apparatus of the character described, comprising a casing, a motorcent-rally disposed therein and having a horizontal shaft, auxiliaryshafts on either end of said motor shaft in substantially aligned drivenrelation therewith, each auxiliary shaft being in supporting engagementat its inner end With but angularly movable With respect to an end ofsaid motor shaft and at its outer end bearing in said casing, a Weighton each auxiliary shaft adjacent the bearing thereof in the casing andunbalanced on the shaft, depending arms on said casing adapted tosupport an element to be vibrated in unison with said casing, and meansfor suspending said casing.

In testimony whereof I hereby affix signature.

HENRY PRELL.

